Needle Unit for Drug Delivery Device

Abstract

The present invention provides an injection needle unit (10) comprising: a needle assembly (20) comprising: an injection needle (25) extending along a longitudinal axis and having a distal needle end configured for insertion into a subject and a proximal needle end configured for penetration of a reservoir septum, and a skirt (22) surrounding the proximal needle end and defining a receiving space (28) for reception of a needle mount of a drug delivery device, the skirt (22) comprising a slot (24), and a block structure (32) supported exteriorly of the skirt (22), wherein the block structure (32) is biased towards the longitudinal axis and is capable of radial displacement through the slot (24) from a latched position outside the receiving space (28) to a released position within the receiving space (28).

Description

FIELD OF THE INVENTION[0001]The present invention relates to needle units for use with drug delivery devices to convey drug from a reservoir to an administration site.BACKGROUND OF THE INVENTION[0002]Administration of medication contained in sealed reservoirs often involves a penetration of the reservoir seal. For example, people with diabetes using pen injection systems for self-administration of insulin or GLP-1 attach a needle assembly comprising an injection needle to the pen injector, whereby a reservoir closure is transpierced by the injection needle, and subsequently operate the pen injector to expel a dose of medication through the injection needle and into the body.[0003]A needle assembly for an injection device typically also comprises a skirt provided with an internal threaded section for engagement with a mating external thread on the injection device. When the needle assembly is properly attached fluid communication to the reservoir interior is established and the injec...

AI Technical Summary

Benefits of technology

The invention aims to address the issue of prior art where a needle unit could be used on multiple injection devices or more than once. The invention provides a needle unit that can only be used on one injection device, ensuring that the safety and reliability of the injection process is not compromised.

Problems solved by technology

However, some people ignore this recommendation and consciously decide to use the same needle assembly again and again.

Even with such a solution, however, excessive use of the needle cannula may lead to other issues such as e.g. needle clogging and / or needle abrasion.

Furthermore, the risk of cross-contamination arising from different users sharing the same needle cannula by using it on their respective injection devices is still present.

However, the spreader is a separate element which is displaced to an inactive position during attachment of the drug delivery device, i.e. the solution requires an additional constructional part which is rendered useless upon the initial use of the dispense interface, adding to the production costs.

None of these prior art lockout solutions appear to be useable for conventional injection systems within diabetes care, where e.g. a pen type injection device is provided with a threaded interface and configured to receive an injection needle assembly with a mating thread, as they are both designed for use in a system where the drug delivery device and the dispense interface are attached, respectively detached, by simple axial relative motion.